Tank-manhole arrangement



' v Nov. l5, 1927.

C. H. FOLMSBEE TANK MANHOLE ARRANGEMENT Patented Nov. 15, 1927.

UNITED STATES GLYDE n. EoLMsEEE, or BAYNNE, NEW JERSEY, AssIGNoE y'roAMERICAN CAR. AND

PATENT OFFICE.

FOUNDRY COMPANY, OF NEW YORKyN. Y., A CORPORATION F NEW JERSEY-TANK-MNHOL-E ARRANGEMENT.

Applicationy f ll'ed September 9, 1926. Serial No. 134,470.

In the drawings: Fig. 1 shows a vertical seotion'through a dome. andmanhole of an insulatedv tank car7 illustrating the application of myinvention tothe manhole, andt also' to a safety valve;

' Fig. 2 is a fragmentary plan view of the parts shownv in Fig. 1, aportion of the tank cover and its securing:V means being broken awayv toexpose parts beneath; mi Fig. 3 is a. fragmentary View 4on a largerscale than Figs. 1 and 2, showingr a'verti'calf radiall section througha portion' ofthe manhole ringJ and: associated parts; f

Fig; 4c is 'affragmentary planviewpf one of the parts'shovvn infFigs. 1-and? 2'.

This inventionx relates tomanhole-con?-` structions and the likefforinsulated containers, such as manholes and safety Vvalves *inthe domes-lof insulated .railway car tanks. The object is to provide a simple,convenient, rugged7 andinexpensive'construction. I also aim to minimizethe necessity for special, parts, b v employing parts that are equallyapplicable and satisfactory for uninsulated tanks. Y

Inthe construction of a manholeiu the dome'- of' atank can. there isgenerally em-f ployed a anged ringrsecuredto they tank shell around themanholel opening:- therein. to which ring-,the manhole cover is suitablysecured.. Such a ring is-iknownv as adome ring-7 or manhole ring.` I f1in.l the case of ordina-ryuninsula-ted tank cars.y a: singleA plain`unsorewthreaded maindomering is used., with. lues for the manholecov-e1'- fastenings (eye-bolts) cast 4integral with it.

In. the case of insulatedtank cars.. a' double dome ring is employed..consisting ofan externally screwv threadediiauged inner main ringfastened to thetank shell.,andy an internally screwv threadedflangedouter. ring applied. after. the insulation'andits protectivecover or sheathingrhave been installed.I and scnewed down. tight on` thesheathing so. as tomake a. watertight ioint. ThisI outer ring, carriesmeansof. attachment. for. themanhole coverafastenings (eyeeboltshin theform of apertured lugs cast integral. with said.r outer ringe Owing tothe outer ring being a separate part, the apertures in the eye boltlugsfhave been further away fromi the center of the manhole in the caseof the insulated tank. thany in the case of the uninsulated one. Hencedifferent covers have been required for the two types. .e

The embodiment of this invention here' shown and described'obviatesthese disad vantages of'present practice7 makingit feasible to` use oneand the samemafin ring and vone and the vsame cover for both types `oftanks, and doing' away altogether with` theouter'ring.-in anythingapproaching its present formi, at any rate. It also avoids aillnecessityfor the screwthreadinq ot thermes heretofore A*required inthe case ofinsulated tanks. l Y

The drawings show a portion of a railwaycar tank shell 5- equipped withvthe usual` dome 6, which is provided with a manhole opening at 7. Thetank shellv 5 and the `dome 6 have a. thermo-insulative covering 8. ofany suitable fibre or other material. with a covering or sheathingr .9'(usually of sheet T netalr)- vover theinsulation.- A-tthe manhole'thereis al flanged dome ring or manhole ring 10.- secured to the sheetmetaldome wall. 6 b v am7 suit-able means (such` asy rivets 11).. andprojecting up through corresponding openin njs iu the insulation 8 andthef (sheet metal.) covering or sheathing 9. AY manhole cover 12fof anysuitableor preferred construction may be emploved it is showny seated.on the upper edge ofthe ring 1.0V and secured by evebolts1.'pivoted onpins 14 extending through pairsrof lugs 1.5; 15Tv whichv mav .be castintegral with the ring. 10: The cover 12 has al' depending. Hansefthatlies inside they ring 10. It mavalsovbe provided with internalinsulation 17. held 'in'. place within th-elangeilbv alining. plate 18securedto the flange 16 at its edges: A safetvgvalve'19 is'sh own(conventionally). mounted over an opening in2 the dome wall 6 andextending up through corresponding openings in the Y insulation 8' andin the=sheathingl 9.

Because of4 irregularities in the tank5 and in the dome 6 as;commercially constructed,

as well as in theinsulation 8 and its shcathf ing 9, it is diiiicult orpractically impossible to secure a reasonably good tit ot the sheathking 9 around the manhole ring l0, or around the safety valve 19.

In the construction here illustrated, this is taken care of (for themanhole 7) by providing a relatively lange opening in the sheathing 9around themanhole ring` lO. with a separate jacket or sheathing ring 20to close the excessive opening. Such a separate sheathing ring 20 caneasily be cut and fitted to the annular cover opening` around themanhole ring 10. notwithstanding any irregularities in either thelocation or' the outline of this opening. The inner and outer edgesofthe sheathing ring 20 may be tightly sealed or jointed around themanhole ring l0 and with th-e inner edge oi the sheathing 9. y Y

As shown in Figs. l, 2, and 8, 'the manhole ring l0 has an externalgroove 22 machined in an. annular enlargement or thickening 23 on itsexterior. to take the inner edge of the sheathing ring Q0. which isfitted and jointed or sealed therein. 'if necessary. Preferably, thisgroove 22 isvot V shape. or flaring. with its lower 'side slopingoutward and downward, and isnarrow enough to Wedge tight on the inneredge ot the sheathing ring 9.0 Without Vallowinr the latter to ubottomin the groove. The ioint between the outer ede'e of the sheathing rineV2O and the surrounding edge of the sheathing 9 comprises an upward onentrough or groove 25, on one of the sheathing parts (as here shown. onthe sheathing ring 2m and a corresponding down-turned iiansfe 26 on theother part (as here shown. on the main portion of the shpathinfr 9around the manhole oneningl. with a llinsr ot sealing material Q7 insaid trough. 'As shown in Finis. 9 and 4. the sheathing ring 9,0 may heinitially formed in a plurality of segments (nreterahly two or more. butnotv morerthan tourl titted and secured together around the manhole ringl0 fitter the latter has been secured in place on the tank shell dome 6.and the insulation 8 and sheathing 9 applied. 'These seu'- ments may beunited hy rivetiiw or/and welding. as shown in Fig. 4. A close. accuratefit ot the flanges 946 in the trough or groove 25 is not reouired.because the hot-poured molten sealing medium 27 (such as rooting cementl`insuresa permanently sealed water-tight ioint.

As shown in Figs. l andy 2. the safety valve 19 is similarly mounted onits openingin the sheathing 9. That is to say. the annular safety valvecasing (or ringl has an annular groove 30 in Which is tted (and jointedor sealed. if necessarvl the inner edge or flange of a sheathing ring3l. The outer edge ot this sheathing ring 3l overlaps the sheathing 9,and may be sealed or bination With the tank shell and its insulation andjacket or sheathing, and an opening therein, of an yexternally grooveddome ring at said opening, and a jacket ring with its inner edge in thering groove and its outer edge sealed With the edge of said sheathing. Y

2. An insulated tank construction of the character described comprisingthe combination With the tank shell and its insulation and jacket orsheathing, andan opening therein, of a dome ring around said opening,and a. jacket ring around said dome ring sealed therewith, andalsoextending under and sealed with the'sheathing. Y

3. An insulated tank construction ofk the With the edge of the sheathingaround said opening. Y f

4. An insulated tank construction of the character described comprisingthe combination with the tank shell and its insulation and jacket orsheathing, and an opening therein. of a domering around said opening,and a jacketrinxr around and interlocked With said dome ring: saidsheathing and sheathing ring having the one an annular sealing troughand the other aj downturned iiange` sealed in said trough. e

5. An insulated tankf construction ofthe character described comprisingthe combination with the tank shell and its insulation and jacket orsheathing, with an open,- ing therein and a downturned ange' on thesheathing around said opening. of an externallv grooyed ringr for saidopening, and jacket ringI having its inner edge in the ring groove andatrough at its outer edge with said downturned sheathing Harige sealedtherein. A A

6. In an insulated tank construction having a.Y dome provided With anopening, a 'dome ring around said opening, a sheathing for said dome.having its upper edge circumferentiallv spaced from said dome ring. anda jacket ring interposed between the dome rin;T and said sheathing andinterlocked therewith.

7. In an insulated tank construction haverentiaily spaced from said domering, and

a jacket ring interposed between the dome ring and said sheathing andsealed therewith.

8. In an insulated tank construction having a dome and a dome ring,means for ef- 1.0 fectng a. close and accurate connection of sheathingwith said dome comprising a segmental Jacket ring sealed to said domering and sheathing. e

In witness whereof'I have hereunto setV 15 myhand.

` GLYDE H. lronisrsnn.

